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ERIC Number: EJ828687
Record Type: Journal
Publication Date: 2009-Feb
Pages: 4
Abstractor: As Provided
Reference Count: 13
ISSN: ISSN-0021-9584
Illustrating the Concept of Sparingly Soluble Salts Using Various Copper Compounds: A Classroom Demonstration
O'Sullivan, Daniel W.; Crouch, Collier C.
Journal of Chemical Education, v86 n2 p202-205 Feb 2009
Many students in general and advanced chemistry courses have difficulty understanding differences in solubility by inspecting changing values of the solubility product constants for sparingly soluble salts. In this demonstration, the concepts involved in understanding the solubility of sparingly soluble salts are illustrated visually. Utilizing bathocuproinedisulfonic acid in a mixed reducing reagent to complex copper(I), we are able to demonstrate to the naked eye copper(I) and copper(II) concentrations resulting from the dissolution of a variety of sparingly soluble copper compounds. The actual concentration of copper in solution can be determined using this visual demonstration in combination with a spectrophotometer. This demonstration visually confirms copper concentrations in the range of 1 x 10[superscript -3] to 1 x 10[superscript -6] M. Calculated solubilities based on a simple algorithm, neglecting secondary equilibria, ion-pair formation, and ionic effects, are in reasonable agreement with the measured solubilities. (Contains 1 table and 1 figure.)
Division of Chemical Education of the American Chemical Society. Subscription Department, P.O. Box 1267, Bellmawr, NJ 08099-1267. Tel: 800-691-9846; Tel: 856-931-5825; Fax: 856-931-4115; e-mail:; Web site:
Publication Type: Journal Articles; Reports - Descriptive
Education Level: Higher Education
Audience: N/A
Language: English
Sponsor: N/A
Authoring Institution: N/A